Screen-cleaning device



Nov. 5, 1929. A. T. HEDFELT 1,734,255h

SCREEN CLEANING DEVICE Filed' June 20. 1927.

z" tor/megs.

Patented Nov. 5, 1929 narran .stares AXEL T. HnnrnLT, on MrNNEAPoLis'MINnEsoTA SCREEN -CLEANING DEVICE Application led June 20,

My invention relates to screen cleaning devices, and more particularly to cleaning devices for use with screens which have a sidewise shake or reciprocating movement. An

object of the invention is to provide a simple and eiiicient device of this character adapted for general use but more particularly adapted for use in connection with screens or sieves of fanning mills, grain separators and grain cleaners. I accomplish the objects of my invention by providing a plurality of spaced longitudinally extending chains or other flexible elements which lie in contact with the upper surface of the screen. rlhese flexible elements are attached at their upper ends to a transverse strip pivotally attached to the upper end of the screen frame and are attached at their lower ends to a loose transverse member so that the chains may have 2e sidewise movement relatively to the perforated surface of the screen.

The full objects and advantages of my invention will appear in connection with the detailed description thereof, and the novel features of my inventive idea will be particularly pointed out in the claims.

In the accompanying drawings which illustrate a practical embodiment of my invention,-

Fig. 1 is a top plan view of the device. Fig. 2 is a fragmentary view in vertical section on the line 2-2 of Fig. 1.'

Referring to the construction shown in the drawings, the numeral 10 designates the frame and the numeral 12 designates the perforated or reticulated portion of the screen. The screen may be mounted for side-shake movement in any suitable or customary manner. As shown, it is supported from the framework 14 of the machine by four outstanding rods 16, 18, 20, and 22. The rods 18 and 2O are pivotally attached to rocker arms 24 and 26 respectively which are mounted on one side of the framework. The rods 22 and 24 are pivotally attached to bell crank levers 28 and 30 respectively which are mounted on the other side of the framework. The two bell cranks are connected by a rod 32. The bell crank 30 is extended outwardly for attachment of a reciprocating rod 34 1927. Serial No. 199,938.

which may be operated by any suitable means. The screen frame has side members 36 and 38 which extend above the perforated portion and it has an upper end member 40 which also extends above the perforated portion. It will be understood from F ig. 2 that the lower end portion of the frame is entirely below the perforated portion in order that the grain may be readily delivered from the screen. A transverse strip 42 is swingingly attached to the upper end member 40 by means of hook members 44. A plurality of spaced chains 46 are attached at their upper ends to the strip 42. The lower ends of these chains are loose with relation to the screen but are attached to a transverse jchain 48 while the two outer chains 46 are additionally secured to a transverse rod 50.

The operation and advantages of my invention will now be understood. When the screen is given a sidewise movement, the chains 46 move back and forth over the perforated surface of the screen. These chains serve not only as longitudinal guides for the grain or material to be cleaned but they stir the grain and prevent dust and other particles from riding on top of theV grain. An important feature of the chains as will be readily understood resides in the fact that they keep the screen clean by preventing clogging of the perforations. v

lf claim:

1. The combination with a screen and means for imparting a sidewise reciprocating movement thereto, of a plurality of spaced longitudinally extending chains, a transverse strip to which the upper ends of said chains are attached, means for swingingly attaching said strip to the upper end of the screen, and a loose transverse member to which the lower ends of said chains are attached, said chains being thereby adapted to move back and forth over the perforated surface of the screen.

2. The combination with a screen and means for imparting a sidewise reciprocating movement thereto, of a plurality of spaced longitudinally extending chains, a transverse strip to which the upper ends of said chains are attached, means for swingingly attaching said strip to the upper end of the screen,

a loose transverse chain to which the lower ends of said chains are attached, and a transverse rod attached to the two outer ones of said longitudinal chains, the longitudinal chains being thereby adapted to move back and forth over the perforated surface of the screen.

In testmonywhereof Ihereuntoax my signature.

T. HEDFELT. 

